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377 lines
10 KiB
377 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* lm83.c - Part of lm_sensors, Linux kernel modules for hardware |
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* monitoring |
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* Copyright (C) 2003-2009 Jean Delvare <[email protected]> |
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* |
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* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is |
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* a sensor chip made by National Semiconductor. It reports up to four |
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* temperatures (its own plus up to three external ones) with a 1 deg |
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* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained |
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* from National's website at: |
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* http://www.national.com/pf/LM/LM83.html |
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* Since the datasheet omits to give the chip stepping code, I give it |
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* here: 0x03 (at register 0xff). |
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* |
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* Also supports the LM82 temp sensor, which is basically a stripped down |
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* model of the LM83. Datasheet is here: |
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* http://www.national.com/pf/LM/LM82.html |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/hwmon.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/sysfs.h> |
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/* |
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* Addresses to scan |
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* Address is selected using 2 three-level pins, resulting in 9 possible |
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* addresses. |
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*/ |
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static const unsigned short normal_i2c[] = { |
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
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enum chips { lm83, lm82 }; |
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/* |
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* The LM83 registers |
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* Manufacturer ID is 0x01 for National Semiconductor. |
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*/ |
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#define LM83_REG_R_MAN_ID 0xFE |
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#define LM83_REG_R_CHIP_ID 0xFF |
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#define LM83_REG_R_CONFIG 0x03 |
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#define LM83_REG_W_CONFIG 0x09 |
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#define LM83_REG_R_STATUS1 0x02 |
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#define LM83_REG_R_STATUS2 0x35 |
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#define LM83_REG_R_LOCAL_TEMP 0x00 |
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#define LM83_REG_R_LOCAL_HIGH 0x05 |
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#define LM83_REG_W_LOCAL_HIGH 0x0B |
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#define LM83_REG_R_REMOTE1_TEMP 0x30 |
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#define LM83_REG_R_REMOTE1_HIGH 0x38 |
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#define LM83_REG_W_REMOTE1_HIGH 0x50 |
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#define LM83_REG_R_REMOTE2_TEMP 0x01 |
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#define LM83_REG_R_REMOTE2_HIGH 0x07 |
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#define LM83_REG_W_REMOTE2_HIGH 0x0D |
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#define LM83_REG_R_REMOTE3_TEMP 0x31 |
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#define LM83_REG_R_REMOTE3_HIGH 0x3A |
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#define LM83_REG_W_REMOTE3_HIGH 0x52 |
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#define LM83_REG_R_TCRIT 0x42 |
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#define LM83_REG_W_TCRIT 0x5A |
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/* |
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* Conversions and various macros |
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* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. |
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*/ |
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#define TEMP_FROM_REG(val) ((val) * 1000) |
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#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \ |
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(val) >= 127000 ? 127 : \ |
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(val) < 0 ? ((val) - 500) / 1000 : \ |
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((val) + 500) / 1000) |
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static const u8 LM83_REG_R_TEMP[] = { |
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LM83_REG_R_LOCAL_TEMP, |
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LM83_REG_R_REMOTE1_TEMP, |
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LM83_REG_R_REMOTE2_TEMP, |
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LM83_REG_R_REMOTE3_TEMP, |
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LM83_REG_R_LOCAL_HIGH, |
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LM83_REG_R_REMOTE1_HIGH, |
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LM83_REG_R_REMOTE2_HIGH, |
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LM83_REG_R_REMOTE3_HIGH, |
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LM83_REG_R_TCRIT, |
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}; |
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static const u8 LM83_REG_W_HIGH[] = { |
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LM83_REG_W_LOCAL_HIGH, |
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LM83_REG_W_REMOTE1_HIGH, |
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LM83_REG_W_REMOTE2_HIGH, |
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LM83_REG_W_REMOTE3_HIGH, |
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LM83_REG_W_TCRIT, |
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}; |
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/* |
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* Client data (each client gets its own) |
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*/ |
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struct lm83_data { |
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struct i2c_client *client; |
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const struct attribute_group *groups[3]; |
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struct mutex update_lock; |
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char valid; /* zero until following fields are valid */ |
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unsigned long last_updated; /* in jiffies */ |
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/* registers values */ |
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s8 temp[9]; /* 0..3: input 1-4, |
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4..7: high limit 1-4, |
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8 : critical limit */ |
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u16 alarms; /* bitvector, combined */ |
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}; |
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static struct lm83_data *lm83_update_device(struct device *dev) |
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{ |
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struct lm83_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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mutex_lock(&data->update_lock); |
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
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int nr; |
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dev_dbg(&client->dev, "Updating lm83 data.\n"); |
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for (nr = 0; nr < 9; nr++) { |
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data->temp[nr] = |
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i2c_smbus_read_byte_data(client, |
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LM83_REG_R_TEMP[nr]); |
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} |
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data->alarms = |
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i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) |
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+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) |
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<< 8); |
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data->last_updated = jiffies; |
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data->valid = 1; |
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} |
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mutex_unlock(&data->update_lock); |
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return data; |
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} |
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/* |
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* Sysfs stuff |
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*/ |
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct lm83_data *data = lm83_update_device(dev); |
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); |
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} |
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static ssize_t temp_store(struct device *dev, |
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struct device_attribute *devattr, const char *buf, |
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size_t count) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct lm83_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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long val; |
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int nr = attr->index; |
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int err; |
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err = kstrtol(buf, 10, &val); |
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if (err < 0) |
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return err; |
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mutex_lock(&data->update_lock); |
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data->temp[nr] = TEMP_TO_REG(val); |
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i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4], |
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data->temp[nr]); |
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mutex_unlock(&data->update_lock); |
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return count; |
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} |
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static ssize_t alarms_show(struct device *dev, struct device_attribute *dummy, |
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char *buf) |
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{ |
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struct lm83_data *data = lm83_update_device(dev); |
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return sprintf(buf, "%d\n", data->alarms); |
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} |
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static ssize_t alarm_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct lm83_data *data = lm83_update_device(dev); |
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int bitnr = attr->index; |
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5); |
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static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6); |
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static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7); |
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static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8); |
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static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8); |
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static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8); |
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static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8); |
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/* Individual alarm files */ |
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0); |
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static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6); |
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8); |
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static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9); |
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static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10); |
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static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12); |
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13); |
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15); |
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/* Raw alarm file for compatibility */ |
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static DEVICE_ATTR_RO(alarms); |
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static struct attribute *lm83_attributes[] = { |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp3_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp3_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_crit.dev_attr.attr, |
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&sensor_dev_attr_temp3_crit.dev_attr.attr, |
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp3_fault.dev_attr.attr, |
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
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&dev_attr_alarms.attr, |
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NULL |
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}; |
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static const struct attribute_group lm83_group = { |
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.attrs = lm83_attributes, |
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}; |
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static struct attribute *lm83_attributes_opt[] = { |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp4_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_max.dev_attr.attr, |
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&sensor_dev_attr_temp4_max.dev_attr.attr, |
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&sensor_dev_attr_temp2_crit.dev_attr.attr, |
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&sensor_dev_attr_temp4_crit.dev_attr.attr, |
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp4_fault.dev_attr.attr, |
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp2_fault.dev_attr.attr, |
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group lm83_group_opt = { |
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.attrs = lm83_attributes_opt, |
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}; |
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/* |
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* Real code |
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*/ |
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/* Return 0 if detection is successful, -ENODEV otherwise */ |
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static int lm83_detect(struct i2c_client *new_client, |
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struct i2c_board_info *info) |
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{ |
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struct i2c_adapter *adapter = new_client->adapter; |
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const char *name; |
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u8 man_id, chip_id; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
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return -ENODEV; |
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/* Detection */ |
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if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) || |
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(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) || |
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(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) { |
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dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n", |
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new_client->addr); |
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return -ENODEV; |
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} |
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/* Identification */ |
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man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID); |
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if (man_id != 0x01) /* National Semiconductor */ |
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return -ENODEV; |
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chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID); |
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switch (chip_id) { |
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case 0x03: |
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name = "lm83"; |
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break; |
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case 0x01: |
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name = "lm82"; |
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break; |
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default: |
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/* identification failed */ |
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dev_info(&adapter->dev, |
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"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n", |
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man_id, chip_id); |
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return -ENODEV; |
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} |
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strlcpy(info->type, name, I2C_NAME_SIZE); |
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return 0; |
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} |
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static const struct i2c_device_id lm83_id[]; |
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static int lm83_probe(struct i2c_client *new_client) |
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{ |
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struct device *hwmon_dev; |
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struct lm83_data *data; |
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data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data), |
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GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = new_client; |
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mutex_init(&data->update_lock); |
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/* |
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* Register sysfs hooks |
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* The LM82 can only monitor one external diode which is |
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* at the same register as the LM83 temp3 entry - so we |
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* declare 1 and 3 common, and then 2 and 4 only for the LM83. |
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*/ |
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data->groups[0] = &lm83_group; |
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if (i2c_match_id(lm83_id, new_client)->driver_data == lm83) |
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data->groups[1] = &lm83_group_opt; |
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hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev, |
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new_client->name, |
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data, data->groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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/* |
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* Driver data (common to all clients) |
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*/ |
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static const struct i2c_device_id lm83_id[] = { |
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{ "lm83", lm83 }, |
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{ "lm82", lm82 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, lm83_id); |
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static struct i2c_driver lm83_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "lm83", |
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}, |
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.probe_new = lm83_probe, |
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.id_table = lm83_id, |
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.detect = lm83_detect, |
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.address_list = normal_i2c, |
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}; |
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module_i2c_driver(lm83_driver); |
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MODULE_AUTHOR("Jean Delvare <[email protected]>"); |
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MODULE_DESCRIPTION("LM83 driver"); |
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MODULE_LICENSE("GPL");
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